Update ONOS version to 1.6.0-rc2

Change-Id: I429843d5dd2a5c6f8ff24ba8634848d45e782de7
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a4f1f28
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+*~
+*.class
+.classpath
+.project
+.settings
+.checkstyle
+target
+*.iml
+.idea